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A horizontal overhead power line carries...

A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.5 m below the line?

Text Solution

Verified by Experts

Here, `I = 90 A , a = 1. 5 m, mu _(0) = 4pi xx 10 ^(-7) T m A^(-1)`
Using relation : `B = ( mu _(0) I )/( 2 pi a ) therefore B = ( 4 pi xx 10 ^(-7) xx 90)/( 2 pi xx 1.5 ) = 1.2 xx 10 ^(-5) T`
According to the right hand thumb rule, the direction of magnetic field is from north to south.
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